Yarn supply chamber

ABSTRACT

A yarn supply chamber formed of regularly displaced, generally longitudinally extending bars connected at one end by a yarn introducing mechanism and at the other end by a closure having a yarn discharge orifice. The bars may be disposed at an angle of from about 0*to 20* with respect to the longitudinal axis of the chamber, the chamber preferably increasing in diameter in the direction of passage of yarn therethrough. The chamber virtually eliminates the formation of loops in the yarn reserve supply. Upon the interruption of the feeding of yarn into the chamber while continuing its withdrawal, the discharge end of the chamber remains substantially uniformly filled with yarn.

United States Patent Havlas et al.

YARN SUPPLY CHAMBER Inventors: Jiri Havlas; Premysl Kostelecky; Zdenek Holy, all of Liberec; Jeromir Rydlo, Vesec u Liberce; Vlastimll Rejnart, Krizany, all of Czechoslovakia Assignee: Elitex, Zavody textilniho strojirenstvl generalni reditelstvi, Liberec, Czechoslovakia Filed: Feb. 13, 1970 Appl. No.: 11,072

Foreign Application Priority Data Feb. 21, 1970 Czechoslovakia ..l258l69 US. Cl ..226/97, 28/ l .4, 28/ 1.6, 226/ 1 18 Int. Cl ..B65h 17/32 Field of Search ..226/118, 97, 196; 242/159,

[56] References Cited UNITED STATES PATENTS 3,303,546 2/1967 Van Blerk ..28/ l .3 3,353,239 ll/l967 Heijnis ..28/L6 Primary Examiner-Richard A. Schacher Attorney-Arthur O. Klein [57] ABSTRACT A yarn supply chamber formed of regularly displaced, generally longitudinally extending bars connected at one end by a yam introducing mechanism and at the other end by a closure having a yarn discharge orifice. The bars may be disposed at an angle of from about 0to 20 with respect to the longitudinal axis of the chamber, the chamber preferably increasing in diameter in the direction of passage of yarn therethrough. The chamber virtually eliminates the formation of loops in the yarn reserve supply. Upon the interruption of the feeding of yarn into the chamber while continuing its withdrawal, the discharge end of the chamber remains substantially uniformly filled with yarn.

9 Claims, 6 Drawing Figures YARN SUPPLY CHAMBER The present invention relates to a yarn supply chamber for forming a yarn reserve during rewinding yarn in textile machines, particularly in automatic winding machines.

Time losses substantially affect the productivity of modern high speed textile machines. The said time losses are caused, to a considerable extent, by the interruption of yarn flow; they were considerably reduced by using yarn knotters able to knot the broken yarn together in about one two-hundredths second. Such yarn knotters are very expensive, due to their accuracy and the frequent maintenance adjustments and the like which they require.

Because of this, a rewinding device has been developed which employs a yarn knotter of simple construction and working at a substantially lower speed. In this device, a yarn reserve is formed in a supply chamber, such yarn reserve being sufficient for carrying on the yarn withdrawal during the time in which the knotting of the broken yarn takes place. The supply chamber is substantially a perforated vessel, or a wire net, into which a pneumatic nozzle for conveying yarn discharges, said perforated vessel or wire net being provided at its bottom with an opening for withdrawing yarn therefrom.

Such an embodiment has several disadvantages, the most important of which is an uneven filling and advancement of the accumulated yarn in the supply chamber; this encourages the formation of loops on the yarn, the loops becoming intermingled and causing yarn breakage,

The present invention has for its object the removal of the said disadvantages; it provides a yarn supply chamber such that upon the interruption of the feeding of yarn into said chamber while continuing its withdrawal, the discharge end of said chamber should remain filled with the yarn as uniformly as possible.

Briefly, the supply chamber according to the present invention is formed of regularly displaced generally longitudinally extending bars disposed at an angle of from to 20 with respect to the longitudinal axis of said chamber. Said bars are located with one of their ends in the body ofthe yarn introducing mechanism and with the other discharge end in a ring provided with a lid. The chamber preferably increases in diameter in the direction of passage of yarn therethrough.

With such construction, the resistance exerted by the supply chamber on the passage of yarn therethrough is considerably reduced; the chamber is thus filled with yarn passing uniformly thereinto, the yarn being stored in the form of a plug, and discharged therefrom, all without forming loops.

Further advantages and features of the present invention are described in the following specification and shown in the accompanying drawings of an exemplary embodiment of the supply chamber according to the present invention, ofwhich FIG. 1 is a view in longitudinal axial section through a frustoconical supply chamber;

FIG. 2 is a cross section through the supply chamber taken along line 2-2 of FIG. 1;

FIG. 3 is a view in end elevation of the lid at the exit of the supply chamber, the view being taken from line 33 of FIG.

FIG. 4 is a plan view of the lid;

FIG. 5 is a schematic view of the passage of yarn through the supply chamber of FIGS. 1 to 4; and

FIG. 6 is a somewhat schematic view in side elevation of a cylindrical supply chamber.

The supply chamber 1 of FIGS. 1 to 5 for the yarn 2 is made in the form of a frustoconical vessel having a vertex angle a of from 0 to about 40. The housing of the said vessel is formed of circular cylindrical bars 3, which are mounted by one of their ends in the body of the yarn introducing mechanism. In the embodiment shown, such mechanism is a pneumatic nozzle 4, represented partially in FIGS. 1 and 5, and with the other ends of the bars being mounted in a ring 5. The bars 3 are spaced evenly about the pneumatic nozzle 4 and the ring 5; each bar is disposed at an angle of 0 to with respect to the axis of the yarn supply chamber 1. The distance between said bars is chosen such as to enable the pressure fluid, or-

dinarily air, by which the yarn 2 is entrained, to escape from the supply chamber 1 immediately downstream of the pneumatic nozzle4. The distance between the confronting surfaces of successive bars 3 can be constant about their whole length, or can increase in the direction towards the discharge end of the supply chamber 1.

The bars 3 shown are circular cylindrical. However, they can be also of another shape, e.g., conical, but they must fulfill the condition of either maintaining a constant mutual distance between the confronting surfaces of successive bars or a condition in which such distance increases in the direction towards the end of the supply chamber 1; the latter applies particularly in the case of using cylindrical bars 3.

The end of the supply chamber 1 is closed by a swingable lid 6 fastened by means of a screw 7 to the ring 5. For the purpose of good guiding of theyarn 2 to be withdrawn from the supply chamber 1, a channel 8 is made in said lid 6.

The passage of yarn 2 and the forming of a yarn reserve is performed in the supply chamber 1 in the following manner:

The yarn 2 is inserted by the pneumatic nozzle 4 into the space of the supply chamber 1 and is simultaneously withdrawn through the channel 8 of lid 6 in the direction S. The velocity at which the yarn 2 is initially fed is chosen to be higher than the velocity of yarn withdrawal, thus forming a yarn supply in the supply chamber 1, which is gradually uniformly filled with said supply. In view of the varying velocities of the fed and withdrawn yarn 2, the supply chamber 1 is provided with control elements (not shown), which interrupt the operation of the pneumatic nozzle 4 when the supply chamber 1 becomes filled. Such control elements function in dependence upon the position of lid 6, thus compensating the feeding and withdrawal of yarn 2. If, in this equilibrium state, the yarn 2 is interrupted, e.g., upon yarn breakage, the withdrawal continues from the supply formed in the supply chamber 1 until the feeding of yarn 2 into the supply chamber 1 is resumed. This must be done at such a speed as to prevent exhaustion of the yarn reserve supply in chamber 1. Thereafter, yarn 2 is again fed by the pneumatic nozzle 4, and thus an equilibrium state between the speed of yarn feeding into chamber 1 and that of withdrawal of yarn therefrom is again attained.

FIG. 6 illustrates a second embodiment of the yarn supply chamber of the invention, wherein the same reference characters are employed with primes to designate parts similar to those in FIGS. 1 to 5, incl. In this embodiment, the chamber 1' is circular cylindrical, that is, the angle a (corresponding to that of FIG. 1) is O. The bars 3' are circular cylindrical rods which are spaced at equal angles about the axis of the chamber 1.

Although the invention has been illustrated and described with reference to two preferred embodiments thereof, it is to be understood that it is in no way limited to the details of such embodiments but is capable of numerous modifications within the scope of the appended claims.

What is claimed is:

1. A chamber for a yarn reserve supply, said chamber being formed of longitudinally extending bars disposed substantially regularly spaced from each other throughout their lengths and about the axis of the chamber, the surfaces of the bars which lie radially outwardly of the chamber being in immediate contact with the atmosphere, means at a first, entrance end of the chamber for feeding yarn and air under pressure thereinto, an abutment substantially spanning the second, discharge end of the chamber, and means providing a discharge passage for the yarn from the second end of the chamber, pressure air escaping from the chamber directly to the atmosphere through the longitudinally extending spaces between successive bars.

2. A yarn reserve supply chamber according to claim 1, wherein the bars are located upon a surface of revolution.

3. A yarn reserve supply chamber according to claim 2, wherein each of the bars forms an angle between 0 and about 20 with the longitudinal axis of the chamber, with any of said values of the angle except 0 the bars diverging from each other in the direction from the first to the second end of the chamber.

4. A yarn reserve supply chamber according to claim 1, wherein successive bars are spaced from each other a distance which is substantially constant along the length of the chamber and is substantially the same from one bar of bars to the next.

5. A yarn reserve supply chamber according to claim 1, wherein the bars are frustoconical, and the distance between the confronting surfaces of successive bars along the length thereof is substantially constant.

6. A yarn reserve supply chamber according to claim 1, wherein the bars are frustoconical, and the distance between the confronting surfaces of successive bars along the length thereof increases in the direction from the first to the second end of the chamber.

7. A yarn reserve supply chamber according to claim 1, wherein the bars are circular cylindrical.

8. A yarn reserve supply chamber according to claim 1, wherein the bars are mounted and held by a part of the yarn feeding means at the first end of the chamber, and by a ring at the second end of the chamber 9. A yarn reserve supply chamber according to claim 8, wherein the abutment at the second end of the chamber is in the form ofa lid mounted upon said ring. 

1. A chamber for a yarn reserve supply, said chamber being formed of longitudinally extending bars disposed substantially regularly spaced from each other throughout their lengths and about the axis of the chamber, the surfaces of the bars which lie radially outwardly of the chamber being in immediate contact with the atmosphere, means at a first, entrance end of the chamber for feeding yarn and air under pressure thereinto, an abutment substantially spanning the second, discharge end of the chamber, and means providing a discharge passage for the yarn from the second end of the chamber, pressure air escaping from the chamber directly to the atmosphere through the longitudinally extending spaces between successive bars.
 2. A yarn reserve supply chamber according to claim 1, wherein the bars are located upon a surface of revolution.
 3. A yarn reserve supply chamber according to claim 2, wherein each of the bars forms an angle between 0* and about 20* with the longitudinal axis of the chamber, with any of said values of the angle except 0 the bars diverging from each other in the direction from the first to the second end of the chamber.
 4. A yarn reserve supply chamber according to claim 1, wherein successive bars are spaced from each other a distance which is substantially constant along the length of the chamber and is substantially the same from one bar of bars to the next.
 5. A yarn reserve supply chamber according to claim 1, wherein the bars are frustoconical, and the distance between the confronting surfaces of successive bars along the length thereof is substantially constant.
 6. A yarn reserve supply chamber according to claim 1, wherein the bars are frustoconical, and the distance between the confronting surfaces of successive bars along the length thereof increases in the direction from the first to the second end of the chamber.
 7. A yarn reserve supply chamber according to claim 1, wherein the bars are circular cylindrical.
 8. A yarn reserve supply chamber according to claim 1, wherein the bars are mounted and held by a part of the yarn feeding means at the first end of the chamber, and by a ring at the second end of the chamber.
 9. A yarn reserve supply chamber according to claim 8, wherein the abutment at the second end of the chamber is in the form of a lid mounted upon said ring. 